<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html lang="en">
<head>
<title>Source code</title>
<link rel="stylesheet" type="text/css" href="../../../../../../stylesheet.css" title="Style">
</head>
<body>
<div class="sourceContainer">
<pre><span class="sourceLineNo">001</span>/*<a name="line.1"></a>
<span class="sourceLineNo">002</span> * Copyright (C) 2008 The Guava Authors<a name="line.2"></a>
<span class="sourceLineNo">003</span> *<a name="line.3"></a>
<span class="sourceLineNo">004</span> * Licensed under the Apache License, Version 2.0 (the "License");<a name="line.4"></a>
<span class="sourceLineNo">005</span> * you may not use this file except in compliance with the License.<a name="line.5"></a>
<span class="sourceLineNo">006</span> * You may obtain a copy of the License at<a name="line.6"></a>
<span class="sourceLineNo">007</span> *<a name="line.7"></a>
<span class="sourceLineNo">008</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.8"></a>
<span class="sourceLineNo">009</span> *<a name="line.9"></a>
<span class="sourceLineNo">010</span> * Unless required by applicable law or agreed to in writing, software<a name="line.10"></a>
<span class="sourceLineNo">011</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.11"></a>
<span class="sourceLineNo">012</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.12"></a>
<span class="sourceLineNo">013</span> * See the License for the specific language governing permissions and<a name="line.13"></a>
<span class="sourceLineNo">014</span> * limitations under the License.<a name="line.14"></a>
<span class="sourceLineNo">015</span> */<a name="line.15"></a>
<span class="sourceLineNo">016</span><a name="line.16"></a>
<span class="sourceLineNo">017</span>package com.google.common.util.concurrent;<a name="line.17"></a>
<span class="sourceLineNo">018</span><a name="line.18"></a>
<span class="sourceLineNo">019</span>import com.google.common.annotations.Beta;<a name="line.19"></a>
<span class="sourceLineNo">020</span><a name="line.20"></a>
<span class="sourceLineNo">021</span>import java.util.concurrent.CancellationException;<a name="line.21"></a>
<span class="sourceLineNo">022</span>import java.util.concurrent.ExecutionException;<a name="line.22"></a>
<span class="sourceLineNo">023</span>import java.util.concurrent.TimeUnit;<a name="line.23"></a>
<span class="sourceLineNo">024</span>import java.util.concurrent.TimeoutException;<a name="line.24"></a>
<span class="sourceLineNo">025</span><a name="line.25"></a>
<span class="sourceLineNo">026</span>/**<a name="line.26"></a>
<span class="sourceLineNo">027</span> * A delegating wrapper around a {@link ListenableFuture} that adds support for<a name="line.27"></a>
<span class="sourceLineNo">028</span> * the {@link #checkedGet()} and {@link #checkedGet(long, TimeUnit)} methods.<a name="line.28"></a>
<span class="sourceLineNo">029</span> *<a name="line.29"></a>
<span class="sourceLineNo">030</span> * @author Sven Mawson<a name="line.30"></a>
<span class="sourceLineNo">031</span> * @since 1.0<a name="line.31"></a>
<span class="sourceLineNo">032</span> */<a name="line.32"></a>
<span class="sourceLineNo">033</span>@Beta<a name="line.33"></a>
<span class="sourceLineNo">034</span>public abstract class AbstractCheckedFuture&lt;V, X extends Exception&gt;<a name="line.34"></a>
<span class="sourceLineNo">035</span>    extends ForwardingListenableFuture.SimpleForwardingListenableFuture&lt;V&gt;<a name="line.35"></a>
<span class="sourceLineNo">036</span>    implements CheckedFuture&lt;V, X&gt; {<a name="line.36"></a>
<span class="sourceLineNo">037</span>  /**<a name="line.37"></a>
<span class="sourceLineNo">038</span>   * Constructs an {@code AbstractCheckedFuture} that wraps a delegate.<a name="line.38"></a>
<span class="sourceLineNo">039</span>   */<a name="line.39"></a>
<span class="sourceLineNo">040</span>  protected AbstractCheckedFuture(ListenableFuture&lt;V&gt; delegate) {<a name="line.40"></a>
<span class="sourceLineNo">041</span>    super(delegate);<a name="line.41"></a>
<span class="sourceLineNo">042</span>  }<a name="line.42"></a>
<span class="sourceLineNo">043</span><a name="line.43"></a>
<span class="sourceLineNo">044</span>  /**<a name="line.44"></a>
<span class="sourceLineNo">045</span>   * Translates from an {@link InterruptedException},<a name="line.45"></a>
<span class="sourceLineNo">046</span>   * {@link CancellationException} or {@link ExecutionException} thrown by<a name="line.46"></a>
<span class="sourceLineNo">047</span>   * {@code get} to an exception of type {@code X} to be thrown by<a name="line.47"></a>
<span class="sourceLineNo">048</span>   * {@code checkedGet}. Subclasses must implement this method.<a name="line.48"></a>
<span class="sourceLineNo">049</span>   *<a name="line.49"></a>
<span class="sourceLineNo">050</span>   * &lt;p&gt;If {@code e} is an {@code InterruptedException}, the calling<a name="line.50"></a>
<span class="sourceLineNo">051</span>   * {@code checkedGet} method has already restored the interrupt after catching<a name="line.51"></a>
<span class="sourceLineNo">052</span>   * the exception. If an implementation of {@link #mapException(Exception)}<a name="line.52"></a>
<span class="sourceLineNo">053</span>   * wishes to swallow the interrupt, it can do so by calling<a name="line.53"></a>
<span class="sourceLineNo">054</span>   * {@link Thread#interrupted()}.<a name="line.54"></a>
<span class="sourceLineNo">055</span>   *<a name="line.55"></a>
<span class="sourceLineNo">056</span>   * &lt;p&gt;Subclasses may choose to throw, rather than return, a subclass of<a name="line.56"></a>
<span class="sourceLineNo">057</span>   * {@code RuntimeException} to allow creating a CheckedFuture that throws<a name="line.57"></a>
<span class="sourceLineNo">058</span>   * both checked and unchecked exceptions.<a name="line.58"></a>
<span class="sourceLineNo">059</span>   */<a name="line.59"></a>
<span class="sourceLineNo">060</span>  protected abstract X mapException(Exception e);<a name="line.60"></a>
<span class="sourceLineNo">061</span><a name="line.61"></a>
<span class="sourceLineNo">062</span>  /**<a name="line.62"></a>
<span class="sourceLineNo">063</span>   * {@inheritDoc}<a name="line.63"></a>
<span class="sourceLineNo">064</span>   *<a name="line.64"></a>
<span class="sourceLineNo">065</span>   * &lt;p&gt;This implementation calls {@link #get()} and maps that method's standard<a name="line.65"></a>
<span class="sourceLineNo">066</span>   * exceptions to instances of type {@code X} using {@link #mapException}.<a name="line.66"></a>
<span class="sourceLineNo">067</span>   *<a name="line.67"></a>
<span class="sourceLineNo">068</span>   * &lt;p&gt;In addition, if {@code get} throws an {@link InterruptedException}, this<a name="line.68"></a>
<span class="sourceLineNo">069</span>   * implementation will set the current thread's interrupt status before<a name="line.69"></a>
<span class="sourceLineNo">070</span>   * calling {@code mapException}.<a name="line.70"></a>
<span class="sourceLineNo">071</span>   *<a name="line.71"></a>
<span class="sourceLineNo">072</span>   * @throws X if {@link #get()} throws an {@link InterruptedException},<a name="line.72"></a>
<span class="sourceLineNo">073</span>   *         {@link CancellationException}, or {@link ExecutionException}<a name="line.73"></a>
<span class="sourceLineNo">074</span>   */<a name="line.74"></a>
<span class="sourceLineNo">075</span>  @Override<a name="line.75"></a>
<span class="sourceLineNo">076</span>  public V checkedGet() throws X {<a name="line.76"></a>
<span class="sourceLineNo">077</span>    try {<a name="line.77"></a>
<span class="sourceLineNo">078</span>      return get();<a name="line.78"></a>
<span class="sourceLineNo">079</span>    } catch (InterruptedException e) {<a name="line.79"></a>
<span class="sourceLineNo">080</span>      Thread.currentThread().interrupt();<a name="line.80"></a>
<span class="sourceLineNo">081</span>      throw mapException(e);<a name="line.81"></a>
<span class="sourceLineNo">082</span>    } catch (CancellationException e) {<a name="line.82"></a>
<span class="sourceLineNo">083</span>      throw mapException(e);<a name="line.83"></a>
<span class="sourceLineNo">084</span>    } catch (ExecutionException e) {<a name="line.84"></a>
<span class="sourceLineNo">085</span>      throw mapException(e);<a name="line.85"></a>
<span class="sourceLineNo">086</span>    }<a name="line.86"></a>
<span class="sourceLineNo">087</span>  }<a name="line.87"></a>
<span class="sourceLineNo">088</span><a name="line.88"></a>
<span class="sourceLineNo">089</span>  /**<a name="line.89"></a>
<span class="sourceLineNo">090</span>   * {@inheritDoc}<a name="line.90"></a>
<span class="sourceLineNo">091</span>   *<a name="line.91"></a>
<span class="sourceLineNo">092</span>   * &lt;p&gt;This implementation calls {@link #get(long, TimeUnit)} and maps that<a name="line.92"></a>
<span class="sourceLineNo">093</span>   * method's standard exceptions (excluding {@link TimeoutException}, which is<a name="line.93"></a>
<span class="sourceLineNo">094</span>   * propagated) to instances of type {@code X} using {@link #mapException}.<a name="line.94"></a>
<span class="sourceLineNo">095</span>   *<a name="line.95"></a>
<span class="sourceLineNo">096</span>   * &lt;p&gt;In addition, if {@code get} throws an {@link InterruptedException}, this<a name="line.96"></a>
<span class="sourceLineNo">097</span>   * implementation will set the current thread's interrupt status before<a name="line.97"></a>
<span class="sourceLineNo">098</span>   * calling {@code mapException}.<a name="line.98"></a>
<span class="sourceLineNo">099</span>   *<a name="line.99"></a>
<span class="sourceLineNo">100</span>   * @throws X if {@link #get()} throws an {@link InterruptedException},<a name="line.100"></a>
<span class="sourceLineNo">101</span>   *         {@link CancellationException}, or {@link ExecutionException}<a name="line.101"></a>
<span class="sourceLineNo">102</span>   * @throws TimeoutException {@inheritDoc}<a name="line.102"></a>
<span class="sourceLineNo">103</span>   */<a name="line.103"></a>
<span class="sourceLineNo">104</span>  @Override<a name="line.104"></a>
<span class="sourceLineNo">105</span>  public V checkedGet(long timeout, TimeUnit unit) throws TimeoutException, X {<a name="line.105"></a>
<span class="sourceLineNo">106</span>    try {<a name="line.106"></a>
<span class="sourceLineNo">107</span>      return get(timeout, unit);<a name="line.107"></a>
<span class="sourceLineNo">108</span>    } catch (InterruptedException e) {<a name="line.108"></a>
<span class="sourceLineNo">109</span>      Thread.currentThread().interrupt();<a name="line.109"></a>
<span class="sourceLineNo">110</span>      throw mapException(e);<a name="line.110"></a>
<span class="sourceLineNo">111</span>    } catch (CancellationException e) {<a name="line.111"></a>
<span class="sourceLineNo">112</span>      throw mapException(e);<a name="line.112"></a>
<span class="sourceLineNo">113</span>    } catch (ExecutionException e) {<a name="line.113"></a>
<span class="sourceLineNo">114</span>      throw mapException(e);<a name="line.114"></a>
<span class="sourceLineNo">115</span>    }<a name="line.115"></a>
<span class="sourceLineNo">116</span>  }<a name="line.116"></a>
<span class="sourceLineNo">117</span>}<a name="line.117"></a>




























































</pre>
</div>
</body>
</html>
